/*
 * Copyright (C) 2012 sol-dock-r authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.pagu.soldockr.repository.cdi;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.enterprise.event.Observes;
import javax.enterprise.inject.UnsatisfiedResolutionException;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.ProcessBean;

import org.springframework.data.repository.cdi.CdiRepositoryExtensionSupport;

import at.pagu.soldockr.core.SolrOperations;

/**
 * @author Christoph Strobl
 */
public class SolrRepositoryExtension extends CdiRepositoryExtensionSupport {

  private final Map<String, Bean<SolrOperations>> solrOperationsMap = new HashMap<String, Bean<SolrOperations>>();

  @SuppressWarnings("unchecked")
  <T> void processBean(@Observes ProcessBean<T> processBean) {
    Bean<T> bean = processBean.getBean();
    for (Type type : bean.getTypes()) {
      if (type instanceof Class<?> && SolrOperations.class.isAssignableFrom((Class<?>) type)) {
        solrOperationsMap.put(bean.getQualifiers().toString(), ((Bean<SolrOperations>) bean));
      }
    }
  }

  void afterBeanDiscovery(@Observes AfterBeanDiscovery afterBeanDiscovery, BeanManager beanManager) {
    for (Entry<Class<?>, Set<Annotation>> entry : getRepositoryTypes()) {

      Class<?> repositoryType = entry.getKey();
      Set<Annotation> qualifiers = entry.getValue();

      Bean<?> repositoryBean = createRepositoryBean(repositoryType, qualifiers, beanManager);
      afterBeanDiscovery.addBean(repositoryBean);
    }
  }

  private <T> Bean<T> createRepositoryBean(Class<T> repositoryType, Set<Annotation> qualifiers, BeanManager beanManager) {
    Bean<SolrOperations> solrOperationBeans = this.solrOperationsMap.get(qualifiers.toString());

    if (solrOperationBeans == null) {
      throw new UnsatisfiedResolutionException(String.format("Unable to resolve a bean for '%s' with qualifiers %s.", SolrOperations.class.getName(), qualifiers));
    }

    return new SolrRepositoryBean<T>(solrOperationBeans, qualifiers, repositoryType, beanManager);
  }

}
